15.37*7.88-9.37*7.88-15.37*2.12+9.37*2.12= *=乘号要简便计算快_数学解答

15.37*7.88-9.37*7.88-15.37*2.12+9.37*2.12= *=乘号
要简便计算
快

人气：212 ℃　时间：2020-01-30 06:05:18

解答

15.37*(7.88-2.12)-9.37*(7.88-2.12)
=(7.88-2.12)*(15.37-9.37)
=5.76*(15.37-9.37)
=5.76*6
=34.56